[Intel-gfx] [PATCH] intel_get_llc_size: Small tool to query LLC size

[Ben Widawsky]

On Wed, Jul 10, 2013 at 08:34:18AM +0200, Daniel Vetter wrote:
> On Tue, Jul 09, 2013 at 07:58:03PM -0700, Ben Widawsky wrote:
> > CC: Chad Versace <chad.versace at linux.intel.com>
> > CC: Bryan Bell <bryan.j.bell at intel.com>
> > Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> 
> So I think we should run this from igt and check its return value. And
> since we've had a few bugs with other (currently untested) igt tools, can
> you please add a new igt_tools testcase which just runs those? I'm
> thinking of intel_reg_dumper and intel_reg_read (with some render ring
> register that exists everywhere) on top of running intel_get_llc_size
> here.

What would you like exactly for the check? Just to make sure platforms
that should have LLC return a value > 1?

As for testing the other tools, I personally want no involvement with
intel_reg_dumper, since I feel maintaining it is a losing effort and
would rather see effort put into quick_dump. I'll write tests for
reg_read/reg_write though.

> And please also add eLLC size querying.

When I see review and signs of those getting merged, I'll gladly do
that. For simple, potentially very useful patches, they're sitting
around doing nothing for an awfully long time. And, I can no longer
easily test them. So poop.

> -Daniel
> 
> > ---
> >  tools/Makefile.am          |  1 +
> >  tools/intel_get_llc_size.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 58 insertions(+)
> >  create mode 100644 tools/intel_get_llc_size.c
> > 
> > diff --git a/tools/Makefile.am b/tools/Makefile.am
> > index 2519169..a064b65 100644
> > --- a/tools/Makefile.am
> > +++ b/tools/Makefile.am
> > @@ -9,6 +9,7 @@ bin_PROGRAMS = 				\
> >  	intel_bios_dumper 		\
> >  	intel_bios_reader 		\
> >  	intel_error_decode 		\
> > +	intel_get_llc_size 		\
> >  	intel_gpu_top 			\
> >  	intel_gpu_time 			\
> >  	intel_gtt 			\
> > diff --git a/tools/intel_get_llc_size.c b/tools/intel_get_llc_size.c
> > new file mode 100644
> > index 0000000..bd384d2
> > --- /dev/null
> > +++ b/tools/intel_get_llc_size.c
> > @@ -0,0 +1,57 @@
> > +/*
> > + * Copyright © 2013 Intel Corporation
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> > + * DEALINGS IN THE SOFTWARE.
> > + *
> > + */
> > +
> > +#include <sys/ioctl.h>
> > +#include "drmtest.h"
> > +#include "i915_drm.h"
> > +
> > +static int get_llc_size(int fd)
> > +{
> > +	struct drm_i915_getparam gp;
> > +	int size;
> > +
> > +	gp.param = I915_PARAM_HAS_LLC;
> > +	gp.value = &size;
> > +
> > +	if (ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp)))
> > +		return 0;
> > +
> > +	return size;
> > +}
> > +
> > +int main(int argc, char **argv)
> > +{
> > +	int size, fd = drm_open_any();
> > +
> > +	size = get_llc_size(fd);
> > +
> > +	if (size == 0)
> > +		fprintf(stdout, "Doesn't have LLC\n");
> > +	else if (size == 1)
> > +		fprintf(stdout, "Kernel is too old to determine LLC size\n");
> > +	else
> > +		fprintf(stdout, "LLC size = %dK\n", size>>10);
> > +
> > +	return 0;
> > +}
> > -- 
> > 1.8.3.2
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

-- 
Ben Widawsky, Intel Open Source Technology Center